A passage from Epictetus
Epictetus, Discourses IV.4
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The good man is not he who does not sin, but he who is able not to sin when he is tempted. He who has not been tempted does not know his own strength.
Related passages
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Begin the morning by saying to thyself, I shall meet with the busy-body, the ungrateful, arrogant, deceitful, envious, unsocial.
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At dawn, when you have trouble getting out of bed, tell yourself: 'I have to go to work — as a human being.'
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Take care not to be Caesarified, or dyed with purple; for it does happen. Keep thyself then simple, good, pure, serious, free from affectation.